public static OrthoNormalBasis makeFromWV(Vector3D w, Vector3D v)
{
OrthoNormalBasis onb = new OrthoNormalBasis();
onb.w.set(w);
onb.w.normalize();
//w.normalize(onb.w);
onb.u = v.cross(onb.w);
onb.u.normalize();
//Vector3.cross(v, onb.w, onb.u).normalize();
onb.v = onb.w.cross(onb.v);
//Vector3.cross(onb.w, onb.u, onb.v);
return(onb);
}
internal RGBColor getIrradiance(Sample x)
{
RGBColor temp = new RGBColor(irr);
temp.addLerp((float)(x.pi.x() - pi.x()), transGradient[0]);
temp.addLerp((float)(x.pi.y() - pi.y()), transGradient[1]);
temp.addLerp((float)(x.pi.z() - pi.z()), transGradient[2]);
Vector3D cross = ni.cross(x.ni);
temp.addLerp((float)cross.x(), rotGradient[0]);
temp.addLerp((float)cross.y(), rotGradient[1]);
temp.addLerp((float)cross.z(), rotGradient[2]);
return(temp);
}
public virtual Vector3D perturbNormal(Vector3D normal, Vector3D localPoint, Primitive primitive)
{
RGBColor color;
Vector3D newNormal;
Vector3D gradientU;
Vector3D gradientV;
Vector3D r, s, t;
Vector3D temp;
double height, heightDiff;
double dx, dy;
double x, y;
double rDamping, tDamping;
double rDampingAbs, tDampingAbs;
double rDampingTotal, tDampingTotal;
double rTotal, tTotal;
s = normal;
r = s.cross(new Vector3D(0, 1, 0));
if (r.norm() < RaytracerPhotonmapping.SceneConstants.EPSILON)
{
r = new Vector3D(0, 1, 0);
if (System.Math.Abs(s.y() - 1) < RaytracerPhotonmapping.SceneConstants.EPSILON)
{
s = new Vector3D(0, 1, 0);
}
else
{
s = new Vector3D(0, -1, 0);
}
}
r.normalize();
t = r.cross(s);
t.normalize();
gradientU = r.scaleNew(gradDisp().x());
gradientV = t.scaleNew(gradDisp().y());
color = source().diffuseColor(primitive.mapTextureCoordinate(localPoint));
height = color.average();
dx = (samples().x() > 1.0)?(2.0 / (samples().x() - 1.0)):0;
dy = (samples().y() > 1.0)?(2.0 / (samples().y() - 1.0)):0;
rTotal = 0;
tTotal = 0;
rDampingTotal = 0;
tDampingTotal = 0;
y = -1.0;
for (int iy = 0; iy < (int)samples().y(); iy++)
{
tDampingAbs = (1.0 - (y * y) * 0.8);
if (tDampingAbs > (1.0 - RaytracerPhotonmapping.SceneConstants.EPSILON))
{
tDampingAbs = 0;
}
tDamping = (y > 0)?tDampingAbs:-tDampingAbs;
x = -1.0;
for (int ix = 0; ix < (int)samples().x(); ix++)
{
temp = gradientU.scaleNew(x);
temp.add(gradientV.scaleNew(y));
temp.add(localPoint);
color = source().diffuseColor(primitive.mapTextureCoordinate(temp));
heightDiff = height - color.average();
rDampingAbs = (1.0 - (x * x) * 0.8);
if (rDampingAbs > (1.0 - RaytracerPhotonmapping.SceneConstants.EPSILON))
{
rDampingAbs = 0;
}
rDamping = (x > 0)?rDampingAbs:-rDampingAbs;
rDampingTotal += rDampingAbs;
tDampingTotal += tDampingAbs;
rTotal += heightDiff * rDamping;
tTotal += heightDiff * tDamping;
x += dx;
}
y += dy;
}
r.scale(rTotal / rDampingTotal);
t.scale(tTotal / tDampingTotal);
newNormal = r.addNew(t);
newNormal.scale(bumpFactor());
newNormal.add(s);
newNormal.normalize();
return(newNormal);
}